from the GNU version of the Collaborative International Dictionary of English
- n. in an incipient or undeveloped state; in conception, but not yet executed.
Sorry, no etymologies found.
This information I had from Parson Hurt, who happened at the time to be in London, whither he had gone to receive clerical orders; and I was informed afterwards by Peyton Randolph, that it had procured me the honor of having my name inserted in a long list of proscriptions, enrolled in a bill of attainder commenced in one of the Houses of Parliament, but suppressed in embryo by the hasty step of events, which warned them to be a little cautious.
But it was the right method, in embryo at least, and ROGER BACON, in spite of tremendous opposition, greater than that under which any man of science may now suffer, persisted in that method to the end, calling upon his contemporaries to adopt it as the only one which results in right knowledge.
In his introduction, Spider Robinson finds this book to contain in embryo nearly all of the themes and tropes that would power Heinlein's whole career.